A 50-year-old woman presented to the otolaryngology clinic after the incidental finding of a mass in the lower part of the left side of her neck. Because she had been unaware of the mass until a recent visit to her primary care physician, she did not know how long the mass had been present or if it had changed in size. She reported no symptoms associated with the mass. She denied shortness of breath, dysphagia, hoarseness, and pain. She also had no hypothyroid or hyperthyroid symptoms. A review of systems revealed no abnormalities. She was in good general health, with no other notable medical, surgical, or family history.